`sub notebook` connection reset by peer

[samos123]

sub notebook .                                             
                                                               
                                                               
                                                               
  > Run (Running)                                              
                                                               
  │ dejs,                                                      
                                                               
  Error: read tcp 192.168.0.249:60908->35.202.26.36:443: read: connection reset by peer                                        
                                                               
  Press "s" to suspend, "d" to delete                          
  │ [I 2023-10-08 18:27:08.985 ServerApp] New terminal with automatic name: 1                                                  
Error from server: error dialing backend: No agent available   
Error from server: error dialing backend: No agent available
Error from server: error dialing backend: No agent available
Error from server: error dialing backend: No agent available
Error from server: error dialing backend: No agent available
Error from server: error dialing backend: No agent available
Error from server: error dialing backend: No agent available
Error from server: error dialing backend: No agent available
Error from server: error dialing backend: No agent available

This happened during a long running notebook